Boyle 12 L. Depth Map & Fishing Spots (ON)

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Lake depth chart

Boyle 12 L., ON

Max 39 ft

Today's read

Where to start

Hopper & ant season (windward banks) window is on — see the hatch outlook

Hatch outlook

Hopper & ant season (windward banks)Active window

Typical here: Jul 1 – Sep 15 · hoppers peak July–August; winged-ant falls show up on warm humid afternoons — a wind event, not a hatch

adultwarm, breezy afternoons, roughly 1–5pm — slap the imitation down hard — the splat is the trigger — then wait; count to three after the rise before setting

Work the windward bank on breezy summer afternoons — that's where the food is. Casting-bubble-and-hopper is the direct translation; otherwise run small topwaters and inline spinners tight along the grass edges and blowdown banks in the afternoon warmth.

The event happens over windward grassy banks, overhanging brush and blowdowns — wherever the breeze dumps the bugs

Fall shiner runActive window

Typical here: Sep 1 – Oct 31 · same push on the Ontario side — Simcoe's shiners migrate shallow as the water cools, and the predators ride with them

adultdaylight for the jig bite; after dark the shiners stack under dock lights with walleyes and pike mixed right in — follow the bait, not the spot — millions of shiners move together and the predators ride with them; silver profile and flash matter

Concentrates hard but travels — the school (and the walleyes under it) can be off a river mouth one week and miles upriver the next.

Jig-and-minnow is the event's signature — a frozen emerald shiner on a 1/4 oz jig drifted along the run; silver jerkbaits and trolled crankbaits take the roaming fish; blade baits under the schools.

The event happens over river mouths and the first miles upriver, warming shallow shorelines, and rocky points where the displaced bait stacks

Next on this water

Spring bug season (brook trout lakes) · forageApr 25 – Jun 30 · in ~8 months

Hex (giant mayfly) · mayflyMay 25 – Aug 10 · in ~9 months

June mayfly hatch (walleye lakes) · mayflyJun 1 – Aug 10 · in ~9 months

Recommendations come from depth structure and seasonal species behavior. Treat them as a starting point, not a guarantee. Contours here are generated from real agency depth surveys; use the survey badge for the provider, dataset, datum and measured coverage. Never use for navigation. Always check local regulations.

Depth · ft

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Recent catches at Boyle 12 L.

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Fishing Boyle 12 L.: what the data says

8-acre lake in Cochrane District, Ontario. The lake tops out around 39 ft. The depth chart comes from Ontario Ministry of Natural Resources and Forestry bathymetric survey data, so the contours are survey-derived rather than computer-modeled. The depth data here comes from the Ontario MNRF survey of 1982 (a transect sounding survey). Here is how the season plays out for each species, straight from the data behind the map.

The drawn water covers 8 acres wrapped in 0.7 miles of bank. With a 1.9 development index there's bank structure worth casting at, in moderation. The shallow band under 15 ft claims about 56% of the surface — that's where the groceries are. Tip to tip the water measures near 0.3 mi. Cochrane District claims this one. If the bite dies, Boyle 11 L. is 0 mi to the northeast.

Brook Trout fishing at Boyle 12 L.

Spring brook trout on Boyle 12 L. hold shallow, usually 2 to 15 ft. They move out to 10 to 30 ft in summer and finish the year down in 3 to 20 ft. Put Main-lake point first on the milk run — a point near 2 ft that grades prime for spring. The feeding windows run early morning and the evening. The summer box starts with a small spoon fished deep or a trolled lake-clear wobbler + worm.

Season	Depth	Best window	Start at	Go-to baits
Spring	2 to 15 ft	dawn & dusk	Main-lake point (2 ft)	Small inline spinner (gold), Tiny spoon
Summer	10 to 30 ft	dawn & dusk	Break off the point (5 ft)	Small spoon fished deep, Trolled lake-clear wobbler + worm
Fall	2 to 15 ft	midday & dawn	Main-lake point (2 ft)	Small spoon (orange), Spinner
Winter	3 to 20 ft	dawn	Break off the point (5 ft)	Small jigging spoon, Tungsten jig + plastic

Yellow Perch fishing at Boyle 12 L.

Start shallow in spring: yellow perch sit in 3 to 12 ft that time of year. Summer pushes them deeper, 10 to 30 ft, and winter fish settle into 15 to 35 ft. The spot to know is Deep basin, a deep basin in about 39 ft of water that rates prime for yellow perch in fall. Warm-month bites cluster around early morning. Throw a drop-shot micro plastics or a small spoon tipped with worm until the fish tell you otherwise.

Season	Depth	Best window	Start at	Go-to baits
Spring	3 to 12 ft	midday & dawn	open water	Small jig + curly tail, Perch-pattern micro crank
Summer	10 to 30 ft	dawn	Break off the point (5 ft)	Drop-shot micro plastics, Small spoon tipped with worm
Fall	12 to 35 ft	midday	Deep basin (39 ft)	Jigging spoon (small), Perch rig / spreader
Winter	15 to 35 ft	midday & dawn	Deep basin (39 ft)	Tungsten jig + spikes, Rattle spoon (small)

Notable structure

Count 3 structure marks on this chart. The deepest, Deep basin, sits near 39 ft.

Deep basin: deep basin, around 39 ft
Break off the point: drop-off, around 5 ft
Main-lake point: point, around 2 ft

Boyle 12 L. fishing regulations

Season dates, license requirements, and size and bag limits for Ontario waters are set by the Ontario fishing regulations (FMZ summary) — and special regulations can apply to Boyle 12 L. specifically, so confirm the current rules before you fish.

Check the official Ontario fishing regulations →

Common questions

How deep is Boyle 12 L.?

Boyle 12 L. is about 39 ft (12 m) deep at its deepest point. The depth data here comes from the Ontario MNRF survey of 1982 (a transect sounding survey).

What fish are in Boyle 12 L.?

Anglers target brook trout, yellow perch on Boyle 12 L..

Where is the best fishing spot on Boyle 12 L.?

Deep basin is the top-rated area: a deep basin in about 39 ft of water that rates prime for yellow perch in fall. The map above holds the full rated-spot list for every species and season.

When is the best time to fish Boyle 12 L.?

For brook trout, the summer bite is best in early morning and the evening. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.

What are the fishing regulations for Boyle 12 L.?

Fishing on Boyle 12 L. is regulated by the Ontario fishing regulations (FMZ summary). Check the official Ontario regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.

Nearby waters

Boyle 11 L. 0 mi · Boyle 10 L. 0 mi · Boyle 8 Lake 1 mi · Guilfoyle No. 69 2 mi · Guilfoyle Lake 64 2 mi · Guilfoyle No. 87 4 mi · Boyle Lake 36 4 mi · Bennet Lake 4 mi · Guilfoyle L. 50 4 mi · Guilfoyle Lake 44 4 mi · Guilfoyle L. 49 4 mi · Guilfoyle L. 94 4 mi

See how Boyle 12 L. stacks up: best yellow perch lakes in Ontario · best brook trout lakes in Ontario

More water nearby: Cochrane District fishing maps (673 charts). Browse all Ontario fishing maps or see every water on DepthScout. Bathymetry: published agency survey data. How we build these maps. Fish here with a sonar unit that logs? Send us your depth data and we'll improve this chart, credited to you. For fishing guidance only, never navigation.